MAF transfer curves

tjabo · **Joined:** Tue Apr 21, 2015 4:18 pm **Posts:** 166

ba114 wrote:

I'm still in the early tuning stages, but I can confirm that at idle, my STFT only drifts between -3% and 3%.

I'm running a 2.2k resistor with mine.

Why is it better than the stock 328 MAF (possibly with a bit more resistor) then? I was thinking that the appeal of this MAF was that it could be run without additional need to fart around with the scaling table like is needed when you use a resistor or larger housing...

So am I correct then that you started with the published MAF table for your Nissan MAF, and then scaled it by 20% or something for the resistor?

ba114 · **Joined:** Wed Oct 21, 2015 2:36 am **Posts:** 980

Slot style mafs aren't susceptible to reversion from when the throttle body closes in blow through setups. Much better than using stock mafs.

If you open my spreadsheet, there's a tab that will scale the maf for you depending in what tube and/or resistor you select.

tjabo · **Joined:** Tue Apr 21, 2015 4:18 pm **Posts:** 166

ba114 wrote:

Slot style mafs aren't susceptible to reversion from when the throttle body closes in blow through setups. Much better than using stock mafs.

If you open my spreadsheet, there's a tab that will scale the maf for you depending in what tube and/or resistor you select.

Good info about the MAFs, thanks!

And that is excellent to know about your spreadsheet now including resistors. I don't think it did when I last looked at it... Or did I just overlook it?

tjabo · **Joined:** Tue Apr 21, 2015 4:18 pm **Posts:** 166

I just ordered the MAF, what size tube are you running it in? I need to order the flange. 3" I'm thinking?

Thanks!!

busterhax · **Joined:** Wed Jan 22, 2014 6:54 pm **Posts:** 1773

The thread says 3"

tjabo · **Joined:** Tue Apr 21, 2015 4:18 pm **Posts:** 166

busterhax wrote:

The thread says 3"

It does seem like that is a safe assumption from all the mentions of 3" this and that, but I thought it wouldn't hurt to double check after I saw the MAF flange he linked for me was for welding onto 4" tube. I have my eye on one for welding onto 3" tube to order as soon as he gives the confirmation.

If reasonably possible, I would like to use the same everything ba114 is so we can compare and share data. Since I think I would like to start my process by tuning the MAF I'd like to get everything here ASAP. I guess I could start with swapping injectors first and get that tuning done while waiting for parts for the MAF swap...

ba114 · **Joined:** Wed Oct 21, 2015 2:36 am **Posts:** 980

tjabo wrote:

ba114 wrote:

Slot style mafs aren't susceptible to reversion from when the throttle body closes in blow through setups. Much better than using stock mafs.

If you open my spreadsheet, there's a tab that will scale the maf for you depending in what tube and/or resistor you select.

Good info about the MAFs, thanks!

And that is excellent to know about your spreadsheet now including resistors. I don't think it did when I last looked at it... Or did I just overlook it?

V3 has all this in it. Will scale it for whatever size tube you specify as well

tjabo · **Joined:** Tue Apr 21, 2015 4:18 pm **Posts:** 166

Great about the V3, thanks!!

Are you using a 3" tube as suspected? I will too if you are.

ba114 · **Joined:** Wed Oct 21, 2015 2:36 am **Posts:** 980

Yes I'm using the 3" tube

tjabo · **Joined:** Tue Apr 21, 2015 4:18 pm **Posts:** 166

Excellent, thanks, I'm on it!

tjabo · **Joined:** Tue Apr 21, 2015 4:18 pm **Posts:** 166

My cheap MAF arrived today, and so did my super nice slot MAF flange and 3" air straightener grid.

Unfortunately though, it totally escaped me to order a connector pigtail for the MAF. I guess I'll shoot down to a junk yard tomorrow and try to grab one unless I can find something nice and cheap on eBay, RockAuto, or Amazon (my favorites). Anyone have any suggestions?

ba114 · **Joined:** Wed Oct 21, 2015 2:36 am **Posts:** 980

tjabo wrote:

My cheap MAF arrived today, and so did my super nice slot MAF flange and 3" air straightener grid.

Unfortunately though, it totally escaped me to order a connector pigtail for the MAF. I guess I'll shoot down to a junk yard tomorrow and try to grab one unless I can find something nice and cheap on eBay, RockAuto, or Amazon (my favorites). Anyone have any suggestions?

Go to the wreckers and grab a pigtail from a 350z, maxima, tiida etc. Many nissans from the mid 2000s run the same plug. It is a different plug to the ford style mafs as far as i can tell.

tjabo · **Joined:** Tue Apr 21, 2015 4:18 pm **Posts:** 166

Alright, sounds good, because otherwise it looks like the pigtails are costing more than the MAF itself, haha...

http://www.ebay.com/itm/Fits-Nissan-Infiniti-Mass-Air-Flow-MAF-Connector-pigtail-harness-350Z-370Z-G35-/282335731374?fits=Make%3ANissan&hash=item41bc855eae:g:6SYAAOSwstxVd527&vxp=mtr

ba114 · **Joined:** Wed Oct 21, 2015 2:36 am **Posts:** 980

Updated the scaling worksheet.
I found a slightly different version of the nissan MAF scaling in another ROM based on a 2.76" tube size.

Compared to the original scaling i pulled from another rom it looks like the new scale will result in slightly better trims at idle.

tjabo · **Joined:** Tue Apr 21, 2015 4:18 pm **Posts:** 166

The scaling table in this V4 table is better than the one in V3!

Interestingly though, it seems that this scaling table with the Nissan MAF in 1" tube, and with a 2.2k resistor is giving significantly lower indicated load than the factory setup did during similar conditions. Just a word of warning because dramatic timing reductions are needed from what I'm seeing so far.

With that in mind though, it seems to be working great, and tuning is progressing well! I think I'll have my N/A area dialed in pretty well by today or tomorrow, and it will be time to add bewst!

Thanks ba114!!!

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